CN102175390B - Piezoelectric sensor calibrating device and method - Google Patents
Piezoelectric sensor calibrating device and method Download PDFInfo
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- CN102175390B CN102175390B CN2011100458567A CN201110045856A CN102175390B CN 102175390 B CN102175390 B CN 102175390B CN 2011100458567 A CN2011100458567 A CN 2011100458567A CN 201110045856 A CN201110045856 A CN 201110045856A CN 102175390 B CN102175390 B CN 102175390B
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- 238000000034 method Methods 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000004020 conductor Substances 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 5
- 238000003860 storage Methods 0.000 claims description 4
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 238000011088 calibration curve Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 3
- 238000005538 encapsulation Methods 0.000 claims description 3
- 230000008676 import Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 230000001174 ascending effect Effects 0.000 claims description 2
- 230000008859 change Effects 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 description 6
- 230000035939 shock Effects 0.000 description 4
- 230000004044 response Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
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Abstract
The invention discloses a piezoelectric sensor calibrating method. The method comprises the following steps of: putting a piezoelectric sensor to be calibrated into a cylinder; inflating air into the cylinder through an aerostatic press, wherein the pressure value of inflated air is displayed synchronously by a pressure meter, and water in the cylinder generates a dynamic water pressure under the action of the dynamic air pressure; according to the dynamic water pressure, outputting a voltage value by the piezoelectric sensor in the cylinder and displaying the fluctuation and change of the voltage data in real time by an oscilloscope; according to the voltage data displayed by the oscilloscope, forming a group of output-input data by corresponding to the pressure value displayed by the pressure meter at that time; generating a high-frequency signal by a signal generator for controlling a control valve so as to regulate the pressure value input by the aerostatic press and obtain multiple groups of the output-input data; establishing a functional relationship between the input data and the output data; and realizing the calibration for the piezoelectric sensor. The method can accurately, simply and conveniently calibrate the piezoelectric sensor in a specific working environment. The invention also provides a piezoelectric-sensor-calibrating device.
Description
Technical field
The present invention relates to a kind of scaling method that detects the piezoelectric sensor of excess pore water pressure, can accurately demarcate, also can demarcate Fiber Bragg Grating FBG excess pore water pressure sensor to the piezoelectric sensor of any small size.
Background technology
The demarcation of sensor; Utilize a kind of standard device exactly; Produce known non electrical quantity (like proof force, displacement etc.) and input in the sensor to be calibrated, obtain the output quantity of sensor, then with the input quantity and the output quantity opening relationships of sensor as input quantity.The demarcation of sensor in the engineering test should be carried out under the environment similar with its service condition, to obtain higher precision.
The shock response method is adopted in the demarcation of piezoelectric sensor and pressure transducer usually.The shock response method has that equipment needed thereby is few, easy and simple to handle, characteristics are easily controlled in adjustment, as the drop hammer type shock testing machine that is used for the force transducer dynamic calibration is exactly according to the weight free-falling, and the impact impulsive force that hammering block produced is as the standard dynamic force.When importing as sensor with impact signal, the sensing system transport function is the Laplace transformation of its output signal, can confirm the transport function of sensor thus.But the demarcation of sensor in the engineering test; Carry out under the similar environment of its service condition of Ying Zaiyu; Yet the shock response method is the actual operating position of analog sensor in the road surface effectively; Calibration result can not truly reflect the performance of piezoelectric sensor, has a certain distance with actual operating position on the road.
Summary of the invention
Technical matters to be solved by this invention is to defective and deficiency in the aforementioned background art, and a kind of caliberating device and scaling method of piezoelectric sensor is provided, and it can demarcate the piezoelectric sensor under the concrete working environment accurately, easily.
The present invention is for solving above technical matters, and the technical scheme that is adopted is:
A kind of caliberating device of piezoelectric sensor; Comprise cylinder, sensor, charge amplifier, oscillograph, operation valve, tensimeter, aerostatic press and signal generator; Cylinder is a closed container, is filled with a certain amount of water in it, and is placed with piezoelectric sensor in the water; And make water level be higher than the apical side height of this piezoelectric sensor, also be provided with two holes on the said cylinder; The conductor wire of said piezoelectric sensor to be calibrated connects charge amplifier via hole on the cylinder, and the output terminal of charge amplifier connects oscillograph; Another hole on the said cylinder connects operation valve through wireway, and the other end of operation valve connects tensimeter and signal generator respectively, and the said manometric other end connects aerostatic press.
Above-mentioned cylinder is a cylindrical structure, is processed by aluminum alloy material, by lid and the driving fit of base by thread spiral.
A kind of scaling method of piezoelectric sensor comprises the steps:
(1) piezoelectric sensor to be calibrated is put into the cylinder that is filled with water, and water level is higher than the apical side height of piezoelectric sensor, and conductor wire is passed by the hole on the cylinder lid, again this hole is carried out encapsulation process;
(2) in cylinder, import atmosphere through aerostatic press, tensimeter can show the force value of input atmosphere synchronously, and this moment, atmosphere got into cylinder through the wireway of operation valve, and the water in the cylinder produces dynamic water-pressure power under the effect of this dynamic air pressure;
(3) piezoelectric sensor in the cylinder is according to this dynamic water-pressure power, and output voltage values carries out sending into oscillograph after data are amplified via charge amplifier, is changed by oscillograph storage and video data fluctuation in real time;
(4) voltage data that shows according to oscillograph, the corresponding force value that this moment, tensimeter showed is as one group of output-input data;
(5) utilize signal generator to produce high-frequency signal, operation valve is controlled, thereby the force value of regulating the aerostatic press input obtains many group described output-input data, sets up the input-output funtcional relationship, accomplishes the demarcation to piezoelectric sensor.
In the above-mentioned steps (5); The gamut of piezoelectric sensor is divided into some equidistant points; According to piezoelectric sensor range branch situation, ascending, increase progressively input standard value gradually, and note and the corresponding magnitude of voltage of each point force value; The many groups of outputs-input data that obtain are listed or be drawn as curve with form, obtain the calibration curve of piezoelectric sensor.
After adopting such scheme, the present invention is through being filled with a certain amount of water in cylinder, and applies air pressure and make it produce dynamic water-pressure power, thereby effectively simulates actual operating position, improves the demarcation degree of accuracy to piezoelectric sensor, and is easy and simple to handle, device is simple.
Description of drawings
Fig. 1 is the structure diagram of caliberating device of the present invention;
Fig. 2 is the process flow diagram of scaling method of the present invention.
Embodiment
Below will combine accompanying drawing and specific embodiment, structure of the present invention and working method will be elaborated.
At first with reference to shown in Figure 1, the present invention provides a kind of caliberating device of piezoelectric sensor, comprises cylinder 5, operation valve 3, tensimeter 2, aerostatic press 1, signal generator 4, charge amplifier 6 and oscillograph 7, will introduce respectively below.
Cylinder 5 is a cylindrical structure, is formed by the aluminum alloy materials Precision Machining of sufficient intensity, and the cylinder 5 that adopts in the present embodiment is made up of base and lid, wherein; The high 5cm of lid, the high 17cm of base, the two is by the high thread helix driving fit of 2cm, and is reserved with two holes in a side of lid; Be respectively applied for and supply conductor wire to draw and use, in the present embodiment, consider actual conditions as air admission hole; The aperture of two holes can be different, and wherein, the hole that the aperture is less is used to supply the conductor wire of built-in pressure/piezoelectric sensor to draw; And for guaranteeing the sealing of cylinder 5, use caulking gum to carry out driving fit, and the bigger hole in aperture is as air admission hole.
Be filled with a certain amount of water in the cylinder 5; And be placed with piezoelectric sensor; Make water level be higher than the apical side height of the piezoelectric sensor of being put into, and the output terminal of said piezoelectric sensor is through the input end of conductor wire connection charge amplifier 6, after charge amplifier 6 enhancing signal; Send into oscillograph 7 again, change by oscillograph 7 storages and video data fluctuation in real time.
In addition, the air admission hole of cylinder 5 connects operation valve 3 through wireway, and the other end of said operation valve 3 also connects tensimeter 2 by wireway, and is connected to aerostatic press 1 via this tensimeter 2; Simultaneously, operation valve 3 also connects signal generator 4 through conductor wire.
Below will combine aforementioned caliberating device, the scaling method of piezoelectric sensor provided by the present invention is described, concrete steps are:
(1) piezoelectric sensor to be calibrated is put into cylinder 5, and conductor wire is passed by the less hole in aperture on the lid of cylinder 5, again this hole is carried out encapsulation process, be filled with water in the described cylinder 5, and water level is higher than the apical side height of piezoelectric sensor;
(2) through aerostatic press 1 input atmosphere, tensimeter 2 can show the force value of input atmosphere synchronously, and this moment, atmosphere got into cylinder 5 through the wireway of operation valve 3, under the effect of this dynamic air pressure, produced dynamic water-pressure power;
(3) piezoelectric sensor in the cylinder 5 is according to this dynamic water-pressure power, and output voltage values carries out sending into oscillograph 7 after data are amplified via charge amplifier 6, is changed by oscillograph 7 storages and video data fluctuation in real time;
(4) voltage data that shows according to oscillograph 7, the corresponding force value that this moment, tensimeter 2 was shown is as one group of output-input data;
(5) utilize signal generator 4 to produce high-frequency signal, operation valve 3 is controlled, thereby the force value of regulating aerostatic press 1 input obtains many group described output-input data, sets up the input-output funtcional relationship, accomplishes the demarcation to piezoelectric sensor.
Specifically; The gamut (measurement range) of piezoelectric sensor is divided into some equidistant points, according to piezoelectric sensor range branch situation, descending, increase progressively input standard value gradually; And note and the corresponding output valve of each point input value (being the force value that tensimeter 2 is shown); To import the descending pointwise of value and successively decrease, note simultaneously and the corresponding output valve of each point input value, the said process reciprocation cycle repeatedly (will be generally 3～10 times) test; The output that obtains-input test data are listed or are drawn as curve with form; Test data is carried out necessary processing, just can obtain the sensor calibration curve according to result, and then the sensitivity of definite sensor, the linearity, sluggishness and repeated.Through analyzing, the relation of voltage and pressure is in a constant relatively linear relationship all the time, and linear fit obtains the relation formula of voltage and pressure: y=kx+b (y is meant voltage, and x is meant pressure, the related coefficient of k and b representative voltage and pressure).
Above embodiment is merely explanation technological thought of the present invention, can not limit protection scope of the present invention with this, every technological thought that proposes according to the present invention, and any change of on the technical scheme basis, being done all falls within the protection domain of the present invention.
Claims (4)
1. the caliberating device of a piezoelectric sensor; It is characterized in that: comprise cylinder, piezoelectric sensor, charge amplifier, oscillograph, operation valve, tensimeter, aerostatic press and signal generator to be calibrated; Cylinder is a closed container, is filled with a certain amount of water in it, and is placed with said piezoelectric sensor in the water; And make water level be higher than the apical side height of this said piezoelectric sensor, also be provided with two holes on the said cylinder; The conductor wire of said piezoelectric sensor connects charge amplifier via hole on the cylinder, and the output terminal of charge amplifier connects oscillograph; Another hole on the said cylinder connects operation valve through wireway, and the other end of operation valve connects tensimeter and signal generator respectively, and the said manometric other end connects aerostatic press.
2. the caliberating device of piezoelectric sensor as claimed in claim 1, it is characterized in that: said cylinder is a cylindrical structure, is processed by aluminum alloy material, by lid and the driving fit of base by thread spiral.
3. the scaling method of the caliberating device of a piezoelectric sensor according to claim 1 is characterized in that comprising the steps:
(1) said piezoelectric sensor is put into the cylinder that is filled with water, and water level is higher than the apical side height of said piezoelectric sensor, and conductor wire is passed by the hole on the cylinder lid, again this hole is carried out encapsulation process;
(2) in cylinder, import atmosphere through aerostatic press, tensimeter can show the force value of input atmosphere synchronously, and this moment, atmosphere got into cylinder through the wireway of operation valve, and the water in the cylinder produces dynamic water-pressure power under the effect of this dynamic air pressure;
(3) the said piezoelectric sensor in the cylinder is according to this dynamic water-pressure power, and output voltage values carries out sending into oscillograph after data are amplified via charge amplifier, is changed by oscillograph storage and video data fluctuation in real time;
(4) voltage data that shows according to oscillograph, the corresponding force value that this moment, tensimeter showed is as one group of input-output;
(5) utilize signal generator to produce high-frequency signal, operation valve is controlled, thereby the force value of regulating the aerostatic press input obtains the described input-output of many groups, sets up the input-output funtcional relationship, accomplishes the demarcation to said piezoelectric sensor.
4. scaling method as claimed in claim 3; It is characterized in that: in the said step (5), the gamut of said piezoelectric sensor is divided into some equidistant points, according to said piezoelectric sensor range branch situation; Ascending, increase progressively input standard value gradually; And note and the corresponding magnitude of voltage of each point force value, curve is listed or is drawn as in the many groups input-output that obtains with form, obtain the calibration curve of said piezoelectric sensor.
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| CN2011100458567A CN102175390B (en) | 2011-02-25 | 2011-02-25 | Piezoelectric sensor calibrating device and method |
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| CN102539067A (en) * | 2011-12-20 | 2012-07-04 | 北京动力机械研究所 | Device and method for simulating underwater calibration of underwater thrust sensor |
| CN102564711A (en) * | 2011-12-20 | 2012-07-11 | 北京动力机械研究所 | Device and method for detecting water tightness performance of underwater sensor |
| CN102519669B (en) * | 2011-12-23 | 2013-09-18 | 合肥工业大学 | Pressure fluctuation calibrating device of pressure or differential pressure sensor and calibrating method thereof |
| CN103196481B (en) * | 2013-04-18 | 2015-04-29 | 中国矿业大学 | Calibrating device and calibrating method of mine fiber grating sensor |
| CN103308124B (en) * | 2013-06-03 | 2015-08-12 | 江苏省交通规划设计院股份有限公司 | A kind of scaling method of fiber grating water-soil environment sensing probe |
| CN105352656A (en) * | 2014-07-30 | 2016-02-24 | 无锡华润上华半导体有限公司 | Test device and test method for pressure sensor |
| CN104330207B (en) * | 2014-11-13 | 2016-08-17 | 中国船舶重工集团公司第七0四研究所 | The most dual-purpose torque sensor calibrating installation waterborne |
| CN104484895B (en) * | 2014-12-24 | 2018-11-20 | 天脉聚源（北京）科技有限公司 | A kind of data display method and device |
| CN105004474B (en) * | 2015-07-13 | 2017-08-22 | 大连理工大学 | A kind of adjustable prefastening piezoelectric force instrument hydraulic calibration loading device |
| CN108955975A (en) * | 2016-03-02 | 2018-12-07 | 哈尔滨工程大学 | A kind of device for demarcating air valve stem dynamic strain meter |
| CN110554792B (en) * | 2018-06-04 | 2021-10-19 | 北京钛方科技有限责任公司 | Sensor calibration adjusting device and method |
| CN108414140B (en) * | 2018-06-05 | 2024-07-05 | 沈阳建筑大学 | Calibrating device for sensing and driving performance of piezoelectric intelligent aggregate sensor |
| CN109682534A (en) * | 2019-03-07 | 2019-04-26 | 安徽省交通勘察设计院有限公司 | A kind of multi-channel miniature pressure sensor calibrating device |
| CN109916556B (en) * | 2019-04-11 | 2023-11-03 | 华能国际电力股份有限公司 | Portable dynamic and static calibration system for pressure sensor |
| CN111157177A (en) * | 2020-02-26 | 2020-05-15 | 南京晟天检测科技有限公司 | High-precision pressure sensor pressure change curve testing device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1595088A (en) * | 2003-07-21 | 2005-03-16 | 陕西帅克传感仪器制造有限公司 | Full-automatic accurate pressure testing control instrument |
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| US20060174686A1 (en) * | 2005-02-07 | 2006-08-10 | Mcfarland Richard D | Portable pressure switch calibration and diagnostic tool |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1595088A (en) * | 2003-07-21 | 2005-03-16 | 陕西帅克传感仪器制造有限公司 | Full-automatic accurate pressure testing control instrument |
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